Kidde AC Plug-in Carbon Monoxide and Explosive Gas Detector Alarm | Nighthawk Sensor Technology | Model # KN-COEG-3

Haven't seen such a well engineered product in years. It has a plug that is snug for wall mounting, can be rotated, and can even be detached to use as a power brick. Battery backup and comes with a Duracell battery. Documentation seems like it was written by an engineer a tad, but it's a great product. Has a small kickstand too. As far as plastic goes, it seems like it's very good quality. The test works well. Nice to see 0 PPM of explosive gas in the home. Hopefully I never have to review its detection ability. Great job, Kidde, and please don't let your product slide like 95% of modern companies are.

Always purchased previously. Discovered the expiration date was already outdated. Kept indicating carbon, had local fire-station try it and same thing happened. ±±Bought different brand from Lowes that works great, 5 yr warranty, etc. Important that you have a carbon doctor that works.

We use these all over our house. They are super convenient and plug into a wall socket. It is convenient for us to do this in bedrooms and hallways rather than hardwire them into our home. They clearly tell you when to replace the backup battery, and even when to replace the unit if it is past its lifetime. These are our second round in our home.

I'm about to wax poetic about the "Safety Siren Pro Series 1000" (or whatever demonic device this is). Let's be clear, this thing detects carbon monoxide like a bloodhound sniffs out a dropped hotdog at a picnic. No complaints there. If there's a rogue molecule of CO within a five-mile radius, this thing will know. It's like having a tiny, hyper-vigilant, gas-detecting chihuahua with a PhD in atmospheric chemistry. But, and this is a BIG but, when those batteries start to wane, oh. sweet merciful heavens... it's like a tiny, metal-clad demon has taken up residence in my home. The beeping... the BEEPING... isn't your standard, "Oh, batteries are low, please replace me" chirp. No, this is a sustained, high-pitched, soul-rending wail that sounds like a chorus of dying smoke detectors harmonizing with a dentist's drill. It starts subtly, a little "beep" here, a little "beep" there. You think, "Oh, I'll change them tomorrow." WRONG. You've just signed a pact with auditory torment. Within hours, it evolves into a relentless, rhythmic pulse of pure, unadulterated annoyance. My cat now hides under the sofa, my plants have visibly wilted, and I've started having flashbacks to that scene in Reefer Madness where the guy leaps out the window, convinced he's being chased by jazz demons. I swear, this thing is less a safety device and more a psychological warfare instrument. It's so effective at alerting you to low batteries that you'll replace them out of sheer, unbridled terror. You'll be sprinting to the store, batteries clutched in your trembling hands, like you're carrying the antidote to the apocalypse. Five stars for gas detection, minus a million for auditory assault. If you value your sanity, buy this thing, but keep a fresh pack of batteries on standby, and maybe invest in some industrial-grade earplugs. You've been warned.

Good CO detector, has 12v backup battery and 110 v plug in main power supply with a long (4’cord). This is a replacement for the first one I purchased 5 years ago. These units have a 5 year design life once they are plugged in. After 5 years of operation they automatically stop working and sound an alarm and message to replace the unit. I like the display, bright and legible red lettering and the alarm is loud enough for me to hear it upstairs even though it’s located in the basement. Yes, I will probably purchase again.